Duff and her husband, Mike Comrie, became parents to Luca Cruz on March 20, and since then we've seen Duff hitting the gym to get back into her pre-baby shape, though she claims she's not doing anything crazy to lose the pounds.

"I think if you ask any pregnant mom, they're like 'I want my body back,' but it takes time," she told Us Weekly earlier this month. "It takes nine months for your body to get that way and it's putting on that weight on purpose. The second I start to get down like 'what happened to my body,' I look at my beautiful baby and I've never been more appreciative for the body that I have."

Sarah Jessica Parker out and about with her precious twins, Marion and Tabitha Broderick.

The Affleck girls are out for a stroll on a sunny day in L.A.

Matilda Ledger steps out with her mom, Michelle Williams.

Kingston and Zuma Rossdale go for a spin in New York City.

Skyler Berman is guaranteed a front-row seat, especially at his mama's show.

Jessica Alba grabs a treat with with daughter Honor.

Katie Holmes and her daughter, Suri Cruise, step out in New York City in August 2012.

Alexis Denisof and a pregnant Alyson Hannigan step out for a walk with their daughter, Satyana.

January Jones and baby Xander hang out by the pool in Topanga Canyon, Calif., in April 2012. (FameFlynet)

Jennifer Lopez hits The Grove with twins Max and Emme.

Nicole Richie and Joel Madden took their kids out for some fun in the sun in Santa Monica, Calif.

A very pregnant Jennifer Garner supports her back as she looks on at daughter Violet.

Gavin Rossdale and Gwen Stefani take their littles out for a day of fishing.

Nicole Kidman steps out with baby Faith, 13 months.

Victoria Beckham was spotted with daughter, Harper, and one of her three sons, Cruz, at the MLS Cup Final in Carson, California.

Heidi Klum takes her kids to the Katy Perry concert at the Staples Center in Los Angeles, California.

Ben Affleck is on daddy duty as he spends the day out with daughters Violet and Seraphina.

Suri Cruise flashes her million dollar smile while out and about in New York City with Mom, Katie Holmes.

Kendra Wilkinson's cute little man, Hank Jr., had a fun day out with his famous mom and dad for a playdate in the park.

Hugh Jackman takes his daughter Ava for a dip while he and his family vacation in St. Tropez, France.

Sandra Bullock steps out with her little guy Louis for a day out in Los Angeles, Calif.

Reese Witherspoon enjoyed a stroll on the beach with her daughter Ava and some friends during a Fourth of July party in Malibu, California.

It was a family affair at the Fourth of July parade in the Pacific Palisades area of Los Angeles. Ben Affleck and wife Jennifer Garner took their adorable little ladies, Violet, 5, and her younger sister Seraphina, 2, to show their red, white and blue pride on July 4th.

Pink and husband Carey Hart enjoy enjoy a beautiful beach day in Malibu, CA with new baby Willow.

Jennifer Lopez takes her twins, Emme and Max to the Parc Monceau in Paris, France where they played on the carousel and swings.

Heidi Klum spends a fun filled day with daughters Leni and Lou at a park in the Tribeca section of New York City.

Halle Berry wears a blue dress over her bikini as she takes her daughter Nahla shopping for groceries at Bristol Farms.

Ellen Pompeo holds on tight to her daughter Stella during a drink break from their play date in New York City.

Bethenny Frankel strolls with her husband Jason Hoppy and their daughter Bryn through the West Village in New York City.

Rachel Zoe and her husband Rodger Berman show off their brand new son Skyler Morrison at the "InStyle's Dinner With A Designer" for Rachel Zoe at Soho House in West Hollywood, California.

Ashlee Simpson shows off her stylish side in a mini skirt and hat as she carries her son Bronx through Studio City in Los Angeles.

Courteney Cox takes her little lady, Coco and a friend, for an ice cream break in Malibu.

Alanis Morissette leaves her home in Los Angeles with her hubby Mario and their 4-month-old son Ever.

Gwen Stefani heads out to Primrose Hill giving her son Zuma a push in the stroller in London, England.

Sean Combs aka Diddy takes his twin daughters D'Lila Star and Jessie James to the Westfield Mall in Century City, Calif.

Jennifer Garner makes her way out actor Adam Sandler'­s home with Seraphina who holds on to a balloon and has a painted face.

Katie Holmes and Suri spent a little time in the hotel pool and it looks like Holmes was trying to teach her little lady how to swim.

Rebecca Gayheart goes for a ride with daughter Billie Beatrice, spending a fun filled mother daughter day at the park in Los Angeles.